157 lines
3.5 KiB
C
157 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* linux/arch/powerpc/kernel/traps.c
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*
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras (paulus@cs.anu.edu.au)
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*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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/*
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* This file handles the architecture-dependent parts of hardware exceptions
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/processor.h>
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/* Returns 0 if exception not found and fixup otherwise. */
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extern unsigned long search_exception_table(unsigned long);
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/* THIS NEEDS CHANGING to use the board info structure.
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*/
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#define END_OF_MEM 0x02000000
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/*
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* Trap & Exception support
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*/
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static void print_backtrace(unsigned long *sp)
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{
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int cnt = 0;
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unsigned long i;
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printf("Call backtrace: ");
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while (sp) {
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if ((uint)sp > END_OF_MEM)
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break;
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i = sp[1];
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if (cnt++ % 7 == 0)
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printf("\n");
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printf("%08lX ", i);
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if (cnt > 32)
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break;
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sp = (unsigned long *)*sp;
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}
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printf("\n");
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}
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static void show_regs(struct pt_regs *regs)
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{
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int i;
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printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
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regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
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printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
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regs->msr, regs->msr & MSR_EE ? 1 : 0,
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regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0,
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regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0,
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regs->msr & MSR_DR ? 1 : 0);
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printf("\n");
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for (i = 0; i < 32; i++) {
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if ((i % 8) == 0)
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printf("GPR%02d: ", i);
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printf("%08lX ", regs->gpr[i]);
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if ((i % 8) == 7)
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printf("\n");
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}
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}
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static void _exception(int signr, struct pt_regs *regs)
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{
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show_regs(regs);
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print_backtrace((unsigned long *)regs->gpr[1]);
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panic("Exception in kernel pc %lx signal %d", regs->nip, signr);
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}
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void MachineCheckException(struct pt_regs *regs)
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{
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unsigned long fixup = search_exception_table(regs->nip);
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/* Probing PCI using config cycles cause this exception
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* when a device is not present. Catch it and return to
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* the PCI exception handler.
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*/
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if (fixup != 0) {
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regs->nip = fixup;
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return;
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}
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printf("Machine check in kernel mode.\n");
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printf("Caused by (from msr): ");
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printf("regs %p ", regs);
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switch (regs->msr & 0x000F0000) {
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case (0x80000000 >> 12):
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printf("Machine check signal - probably due to mm fault\n"
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"with mmu off\n");
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break;
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case (0x80000000 >> 13):
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printf("Transfer error ack signal\n");
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break;
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case (0x80000000 >> 14):
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printf("Data parity signal\n");
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break;
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case (0x80000000 >> 15):
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printf("Address parity signal\n");
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break;
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default:
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printf("Unknown values in msr\n");
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}
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show_regs(regs);
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print_backtrace((unsigned long *)regs->gpr[1]);
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panic("machine check");
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}
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void AlignmentException(struct pt_regs *regs)
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{
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show_regs(regs);
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print_backtrace((unsigned long *)regs->gpr[1]);
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panic("Alignment Exception");
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}
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void ProgramCheckException(struct pt_regs *regs)
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{
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show_regs(regs);
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print_backtrace((unsigned long *)regs->gpr[1]);
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panic("Program Check Exception");
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}
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void SoftEmuException(struct pt_regs *regs)
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{
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show_regs(regs);
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print_backtrace((unsigned long *)regs->gpr[1]);
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panic("Software Emulation Exception");
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}
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void UnknownException(struct pt_regs *regs)
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{
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printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
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regs->nip, regs->msr, regs->trap);
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_exception(0, regs);
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}
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void DebugException(struct pt_regs *regs)
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{
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printf("Debugger trap at @ %lx\n", regs->nip);
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show_regs(regs);
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}
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